Measured Progress: Southern California-Inspired Developments are Creating a Global Data Resource

This article gives an overview of how the Performance Measurement System (PeMS), developed at the University of California at Berkeley can be used to help analyze highway performance on both a regional and statewide basis. PeMS stores traffic data from the six most congestion-prone districts of the California Department of Transportation (Caltrans).Data from the PeMS can be used to help determine the need for additional freeway lanes or ramp metering, as well as provide travel time predictions that are then displayed on Caltrans’ variable message signs (VMS). The article notes that the San Bernardino and Riverside counties, forming Caltrans District 08, have experienced significant increases in freeway congestion but suffer from a lack of detectors on many of the key freeways. The ensuing lack of data results in an inability to provide travelers with information. It also leads to a lack of performance information, which in turn can make funding for freeway improvements that much harder to obtain.


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  • Accession Number: 01047161
  • Record Type: Publication
  • Source Agency: UC Berkeley Transportation Library
  • Created Date: Apr 9 2007 1:07PM